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added clarification stating the counter_cache attribute needs to be created on the associate class via a migration

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Michael de Silva 2012-03-11 06:30:06 +03:00
parent 52bbff4e89
commit ce8df43a36
1 changed files with 3 additions and 1 deletions
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activerecord/lib/active_record/associations.rb
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@ -1382,7 +1382,9 @@ module ActiveRecord
# and +decrement_counter+. The counter cache is incremented when an object of this
# class is created and decremented when it's destroyed. This requires that a column
# named <tt>#{table_name}_count</tt> (such as +comments_count+ for a belonging Comment class)
# is used on the associate class (such as a Post class). You can also specify a custom counter
# is used on the associate class (such as a Post class) - that is the migration for
# <tt>#{table_name}_count</tt> is created on the associate class (such that Post.comments_count will
# return the count cached, see note below). You can also specify a custom counter
# cache column by providing a column name instead of a +true+/+false+ value to this
# option (e.g., <tt>:counter_cache => :my_custom_counter</tt>.)
# Note: Specifying a counter cache will add it to that model's list of readonly attributes